6EL3:
reference: PRISEs (progesterone 5beta-reductase and/or iridoid synthase-like 1,4-enone reductases): Catalytic and substrate promiscuity allows for realization of multiple pathways in plant metabolism., Schmidt K, Petersen J, Munkert J, Egerer-Sieber C, Hornig M, Muller YA, Kreis W, Phytochemistry. 2018 Aug 29;156:9-19. doi: 10.1016/j.phytochem.2018.08.012. PMID: 30172078

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